I used to think that when you died, you spent a period of time in heaven, and then went to hell -- sort of a reverse purgatory. This came from the fact that this was what happened in that "Found a Peanut" song (where the guy eats a rotten peanut and dies) when my mom sung it.
A childhood belief about afterlife

others believed things like this
- I used to think that God looked like/ was Mr. Peanut. He was a giant peanut with a top hat, monacle and cane.— Erica
- I used to believe that peanut butter was lobster poo.— PaulH(nz)
- My daughter thought that ear wax was peanut butter.— Bobbiemac
- When I was a little boy, I thought that hair was made out of peanut butter.Anon
- i used to believe that the chunks in chunky peanut butter were bugs.— Lauren
- I used to believe that my mother invented peanut butter and jelly sandwiches. Anon